The 2005 GMC Sierra has a number of options available for its engine. While the base model with the regular cab incorporates a V6 engine with a capacity of 4.3 liters, a more powerful 5.3-liter V8 engine is provided under the hood of the Crew Cab model. Additional power is available in the extended cab models with all-wheel drive, the horsepower for those models of the 2005 Sierra being as high as 310 horsepower.
Another feature worth mentioning about the 2005 Sierra is the Autotrac traction control mechanism designed by General Motors. Two-wheel drive versions of the 2005 Sierra are also available.